Solutions Test ...

The vapour pressure of a pure liquid solvent (X) is decreased to 0.60 atm from 0.80 atm on the addition of a non-volatile substance (Y). The mole fraction of Y in the solution is:

Number of gm of oxygen in 32.2 g $$ Na_2SO_4.10H_2O $$ is 

One mole of calcium phosphide on reacting with excess of water gives:

Relative lowering in vapour pressure of a solution containing 1 mole $$K_{2}SO_{4}$$  in 54 g $$H_{2}O$$  is: ( $$K_{2}SO_{4}$$ is 100 % ionised ) 

On mixing $$10 \mathrm { ml } \mathrm { CCl } _ { 4 }$$ and 10$$\mathrm { ml }$$ benzene, the total volume of solution is :

A solution is 20% ethanol by volume is found to have a density of 0.977 g/ml. The density of ethanol is 0.789 g/ml. The mass per cent of ethanol solution is:

There are two oxides of sulphur. They contain 50% and 60% of oxygen respectively by weight. The weights of sulphur which combine with 1 gm of oxygen are in the ratio of: 

$$18 g$$ glucosse $$\left( C _ { 6 } H _ { 12 } O _ { 6 } \right)$$ is added to 178.2 g water. The vapor pressure of water (in torr) for aqueous solution is

The vapour pressure of acetone at $$ 20^0 C $$ is 185 torr. when 1.2 g of non-volatile substance was dissolved in 100 g of acetone at $$ 20^0 C $$, its vapour pressure was 183 torr. the molar mass (in$$g.mol^{-1}$$)of the substances is ;

One mole of non-volatile solute is dissolved in two moles of water. The vapour pressure of the solution relative to that of water is: